期刊
PHOTONICS RESEARCH
卷 7, 期 1, 页码 42-49出版社
OPTICAL SOC AMER
DOI: 10.1364/PRJ.7.000042
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资金
- National Natural Science Foundation of China (NSFC) [61635006, 91750108, 61520106014]
- Science and Technology Commission of Shanghai Municipality (STCSM) [16520720900]
We experimentally demonstrate two kinds of all few-mode fiber (FMF) ring lasers with high-order mode (HOM) oscillation in the laser cavity. One kind is a switchable-wavelength all-FMF HOM laser with an output of tunable optical vortex beams (OVBs); the other is a Q-switched all-FMF HOM laser with an output of pulsed cylindrical vector beams (CVBs). The lasers are composed of all-FMF components and few-mode erbium-doped fiber. A Sagnac interferometer made of a 3 dB FMF coupler functions as the wavelength selector, and switchable multiwavelength tunable OVBs are experimentally realized. Carbon nanotube-based saturable absorbers and the nonlinear polarization rotation technique are used to achieve Q-switched CVB lasers. This is the first report, to our knowledge, on the generation of switchable-wavelength and Q-switched HOM beams in all-FMF laser cavities. (C) 2018 Chinese Laser Press
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